Social Studies
1.the aztecs adapted to their environment mainly by a.using terracing and irrigation to farm b. living a nomadic hunter gatherer lifestyle c.trading peacefully with neighbors

Science
You are sitting in a rowboat on a lake, watching waves created by a passing motorboat. If you count 4 crest pass every second, and the crests are 5 feet apart, what is the speed of the water waves?

Maths (Proof)
IF A (0,-7) and B (7,0) AB = Sqrt of (0-7)^2 + (-7-0) and that is sqrt of 7^2 + 7^2 not 7? Okay but a regular octagon is meant to have all sides of the same length. (7,0) to (5,-5) is a side and (5,-5) to (0,-7) is a side. (7,0) to (-7,0) is not a side, so why would it matter...

Maths (Proof)
An octagon is formed by joining the points (7,0), (5,5), (0,7), (-5,5), (-7,0), (-5,-5), (0,-7), (5,-5) and (7,0). The octagon is regular. I have used proof by exhaustion and got that all sides are square root of 29. Then sketched it, and all sides were also same length. But ...

chemistry
The total phosphate concentration in a blood sample is determined by spectrophotometry to be 3.0×10−3 M. The pH of the blood sample is 7.45, What are the concentrations of H2PO4− and HPO42- in the blood? Pka for the phosphate system is 7.198

science
_______ describes all the processes associated with the discharge of magma, hot fluids, ash, and gases.

Chemistry
you add excess sodium sulfate to a solution of a soluble barium compound in order to precipitate all of the barium ion as barium sulfate, BaSO4. Suppose a 458 mg sample of the barium compound is dissolved to create the solution. Then when the sodium is added, 513 mg of barium ...

Chemistry
you add excess sodium sulfate to a solution of a soluble barium compound in order to precipitate all of the barium ion as barium sulfate, BaSO4. Suppose a 458 mg sample of the barium compound is dissolved to create the solution. Then when the sodium is added, 513 mg of barium ...

geometry
maria wants to cover a wooden cube with carpeting on 4 of its faces. if the cube has an edge of 2ft, how much surface area will maria have to cover?

science
You are sitting in a rowboat on a lake, watching waves created by passing motorboat. If you have count 4 crest every second and the crest are 5 ft apart, what is the speed of the water waves?

math
it is greater than 43 and less than 52. if you add the digits, the sum is 8. write the number word.

math
It is greater than 30 and less than 40. If you add the digits, the sum is 10. What is the number word.

Electrochem
I'm wondering the exact problem! I don't do how to write the balanced equation..

Math
Consider the following where s is in feet and t is in seconds. s(t) = t^3 + 4t^2 + 6t + 4 (a) Find v(t). v(t) = (b) Find a(t). a(t) = (c) Find v(3). (d) Find a(3). v(t) is the first derivative of s(t). a(t) is the second derivative of s(t). I will be happy to critique your ...

history
What is the name of Dick Cheney's Mansion in St. Micheals off the Chesepeake Bay? Thank you http://www.google.com/search?q=dick+cheney+mansion+chesapeake&start=0&ie=utf-8&oe=utf-8&client=firefox-a&rls=org.mozilla:en-US:official Here are several websites that may answer ...